What is 2 hundreds 9 tens and 18 ones in standard form

-20 yards

Step-by-step explanation:

Given : Bobby’s football team received four five-yard penalties in the first quarter.

i.e. Number of five-yard penalties in the first quarter =4

It meant his team lost yardage in their progress toward the goal line.

Then, the  change in their progression down the field as a result of these penalties :

Hence, the  change in their progression down the field as a result of these penalties = -20 yards